SiC_(f)/TC11复合材料拉伸行为研究

Study on tensile behavior of SiC_(f)/TC11 composites

采用磁控溅射先驱丝法和热等静压工艺制备SiC_(f)/TC11复合材料,研究了SiC_(f)/TC11复合材料室温和500℃拉伸性能及断裂机制。结果表明,SiC_(f)/TC11复合材料室温和500℃抗拉强度分别为1 530 MPa和1 553 MPa,明显高于基体TC11钛合金,与TC11钛合金相比,抗拉强度分别提升了~57%和~133%,纤维增强效果显著。通过观察SiC_(f)/TC11复合材料室温、500℃拉伸断口和纵剖面断裂特征,指出了室温和500℃拉伸断裂机制主要包括反应层多次断裂、纤维一次断裂、纤维多次断裂、纤维-基体界面脱粘、纤维拔出、W芯-SiC界面脱粘、基体断裂、包套断裂等,揭示了SiC_(f)/TC11复合材料室温和500℃拉伸载荷下多组元失效断裂过程。

In this paper,SiC_(f)/TC11 composites were prepared by magnetron sputtering precursor wire method and hot isostatic pressing.Tensile properties and fracture mechanism of SiC_(f)/TC11 composites at room temperature and 500℃were studied.The experimental results show that the tensile strength of SiC_(f)/TC11 composite at room temperature and 500℃are 1530 MPa and 1553 MPa,respectively,which are significantly higher than that of the matrix TC11 titanium alloy.Compared with TC11 titanium alloy,the tensile strength increases by~57% and~133%,respectively,and the fiber reinforcement effect is remarkable.By observing the fracture characteristics and longitudinal section of SiC_(f)/TC11 composites,it is proposed that the tensile fracture mechanism at room temperature and 500℃ mainly includes reaction layer multiple fracture,fiber single fracture,fiber multiple fracture,fiber-matrix interface debonding,fiber pulling out,W core-SiC interface debonding,matrix fracture,sheath fracture,etc.In this paper,the multi-component fracture process of SiC_(f)/TC11 composites under tensile loading at room temperature and 500℃is revealed.